The typical salmon-eating demographic is such that the vast majority prefer the farmed product strictly out of familiarity. Statistically, most folks' first taste of salmon is farmed Atlantics. If they find it pleasing to their palate, that's what they reach for at the time of next purchase. The choice is even more strongly reinforced if it's attainable at a lower price point. It's what they like because it's what they know. When presented with the opportunity to finally try the alternative, the unique taste/texture of the wild product is so different, it's considered "abnormal" for lots of these folks.... therefore deemed inferior.

I think it works just the same way (only in reverse) for those of us who grew up eating wild-caught salmon.